// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package integration

import (
	"context"
	"fmt"
	"net"
	"sync"
	"time"

	"github.com/cockroachdb/errors"
	clientv3 "go.etcd.io/etcd/client/v3"
	"go.uber.org/zap"

	"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
	grpcdatacoord "github.com/milvus-io/milvus/internal/distributed/datacoord"
	grpcdatacoordclient "github.com/milvus-io/milvus/internal/distributed/datacoord/client"
	grpcdatanode "github.com/milvus-io/milvus/internal/distributed/datanode"
	grpcdatanodeclient "github.com/milvus-io/milvus/internal/distributed/datanode/client"
	grpcindexnode "github.com/milvus-io/milvus/internal/distributed/indexnode"
	grpcindexnodeclient "github.com/milvus-io/milvus/internal/distributed/indexnode/client"
	grpcproxy "github.com/milvus-io/milvus/internal/distributed/proxy"
	grpcproxyclient "github.com/milvus-io/milvus/internal/distributed/proxy/client"
	grpcquerycoord "github.com/milvus-io/milvus/internal/distributed/querycoord"
	grpcquerycoordclient "github.com/milvus-io/milvus/internal/distributed/querycoord/client"
	grpcquerynode "github.com/milvus-io/milvus/internal/distributed/querynode"
	grpcquerynodeclient "github.com/milvus-io/milvus/internal/distributed/querynode/client"
	grpcrootcoord "github.com/milvus-io/milvus/internal/distributed/rootcoord"
	grpcrootcoordclient "github.com/milvus-io/milvus/internal/distributed/rootcoord/client"
	"github.com/milvus-io/milvus/internal/storage"
	"github.com/milvus-io/milvus/internal/util/dependency"
	"github.com/milvus-io/milvus/pkg/log"
	"github.com/milvus-io/milvus/pkg/util/etcd"
	"github.com/milvus-io/milvus/pkg/util/paramtable"
)

type MiniClusterV2 struct {
	ctx context.Context

	mu sync.RWMutex

	params        map[string]string
	clusterConfig ClusterConfig

	factory      dependency.Factory
	ChunkManager storage.ChunkManager

	EtcdCli *clientv3.Client

	Proxy      *grpcproxy.Server
	DataCoord  *grpcdatacoord.Server
	RootCoord  *grpcrootcoord.Server
	QueryCoord *grpcquerycoord.Server

	DataCoordClient  *grpcdatacoordclient.Client
	RootCoordClient  *grpcrootcoordclient.Client
	QueryCoordClient *grpcquerycoordclient.Client

	ProxyClient     *grpcproxyclient.Client
	DataNodeClient  *grpcdatanodeclient.Client
	QueryNodeClient *grpcquerynodeclient.Client
	IndexNodeClient *grpcindexnodeclient.Client

	DataNode  *grpcdatanode.Server
	QueryNode *grpcquerynode.Server
	IndexNode *grpcindexnode.Server

	MetaWatcher MetaWatcher
}

type OptionV2 func(cluster *MiniClusterV2)

func StartMiniClusterV2(ctx context.Context, opts ...OptionV2) (*MiniClusterV2, error) {
	cluster := &MiniClusterV2{
		ctx: ctx,
	}
	paramtable.Init()
	cluster.params = DefaultParams()
	cluster.clusterConfig = DefaultClusterConfig()
	for _, opt := range opts {
		opt(cluster)
	}
	for k, v := range cluster.params {
		params.Save(k, v)
	}
	// setup etcd client
	etcdConfig := &paramtable.Get().EtcdCfg
	etcdCli, err := etcd.GetEtcdClient(
		etcdConfig.UseEmbedEtcd.GetAsBool(),
		etcdConfig.EtcdUseSSL.GetAsBool(),
		etcdConfig.Endpoints.GetAsStrings(),
		etcdConfig.EtcdTLSCert.GetValue(),
		etcdConfig.EtcdTLSKey.GetValue(),
		etcdConfig.EtcdTLSCACert.GetValue(),
		etcdConfig.EtcdTLSMinVersion.GetValue())
	if err != nil {
		return nil, err
	}
	cluster.EtcdCli = etcdCli

	cluster.MetaWatcher = &EtcdMetaWatcher{
		rootPath: etcdConfig.RootPath.GetValue(),
		etcdCli:  cluster.EtcdCli,
	}

	// setup clients
	cluster.RootCoordClient, err = grpcrootcoordclient.NewClient(ctx)
	if err != nil {
		return nil, err
	}
	cluster.DataCoordClient, err = grpcdatacoordclient.NewClient(ctx)
	if err != nil {
		return nil, err
	}
	cluster.QueryCoordClient, err = grpcquerycoordclient.NewClient(ctx)
	if err != nil {
		return nil, err
	}

	cluster.ProxyClient, err = grpcproxyclient.NewClient(ctx, paramtable.Get().ProxyGrpcClientCfg.GetInternalAddress(), 0)
	if err != nil {
		return nil, err
	}
	cluster.DataNodeClient, err = grpcdatanodeclient.NewClient(ctx, paramtable.Get().DataNodeGrpcClientCfg.GetAddress(), 0)
	if err != nil {
		return nil, err
	}
	cluster.QueryNodeClient, err = grpcquerynodeclient.NewClient(ctx, paramtable.Get().QueryNodeGrpcClientCfg.GetAddress(), 0)
	if err != nil {
		return nil, err
	}
	cluster.IndexNodeClient, err = grpcindexnodeclient.NewClient(ctx, paramtable.Get().IndexNodeGrpcClientCfg.GetAddress(), 0, false)
	if err != nil {
		return nil, err
	}

	// setup servers
	cluster.factory = dependency.NewDefaultFactory(true)
	chunkManager, err := cluster.factory.NewPersistentStorageChunkManager(cluster.ctx)
	if err != nil {
		return nil, err
	}
	cluster.ChunkManager = chunkManager

	cluster.RootCoord, err = grpcrootcoord.NewServer(ctx, cluster.factory)
	if err != nil {
		return nil, err
	}
	cluster.DataCoord = grpcdatacoord.NewServer(ctx, cluster.factory)
	if err != nil {
		return nil, err
	}
	cluster.QueryCoord, err = grpcquerycoord.NewServer(ctx, cluster.factory)
	if err != nil {
		return nil, err
	}
	cluster.Proxy, err = grpcproxy.NewServer(ctx, cluster.factory)
	if err != nil {
		return nil, err
	}
	cluster.DataNode, err = grpcdatanode.NewServer(ctx, cluster.factory)
	if err != nil {
		return nil, err
	}
	cluster.QueryNode, err = grpcquerynode.NewServer(ctx, cluster.factory)
	if err != nil {
		return nil, err
	}
	cluster.IndexNode, err = grpcindexnode.NewServer(ctx, cluster.factory)
	if err != nil {
		return nil, err
	}
	return cluster, nil
}

func (cluster *MiniClusterV2) Start() error {
	log.Info("mini cluster start")
	ports, err := GetAvailablePorts(7)
	if err != nil {
		return err
	}
	log.Info("minicluster ports", zap.Ints("ports", ports))
	params.Save(params.RootCoordGrpcServerCfg.Port.Key, fmt.Sprint(ports[0]))
	params.Save(params.DataCoordGrpcServerCfg.Port.Key, fmt.Sprint(ports[1]))
	params.Save(params.QueryCoordGrpcServerCfg.Port.Key, fmt.Sprint(ports[2]))
	params.Save(params.DataNodeGrpcServerCfg.Port.Key, fmt.Sprint(ports[3]))
	params.Save(params.QueryNodeGrpcServerCfg.Port.Key, fmt.Sprint(ports[4]))
	params.Save(params.IndexNodeGrpcServerCfg.Port.Key, fmt.Sprint(ports[5]))
	params.Save(params.ProxyGrpcServerCfg.Port.Key, fmt.Sprint(ports[6]))

	err = cluster.RootCoord.Run()
	if err != nil {
		return err
	}

	err = cluster.DataCoord.Run()
	if err != nil {
		return err
	}

	err = cluster.QueryCoord.Run()
	if err != nil {
		return err
	}

	err = cluster.DataNode.Run()
	if err != nil {
		return err
	}

	err = cluster.QueryNode.Run()
	if err != nil {
		return err
	}

	err = cluster.IndexNode.Run()
	if err != nil {
		return err
	}

	err = cluster.Proxy.Run()
	if err != nil {
		return err
	}

	ctx2, cancel := context.WithTimeout(context.Background(), time.Second*120)
	defer cancel()
	healthy := false
	for !healthy {
		checkHealthResp, _ := cluster.Proxy.CheckHealth(ctx2, &milvuspb.CheckHealthRequest{})
		healthy = checkHealthResp.IsHealthy
		time.Sleep(time.Second * 1)
	}
	if !healthy {
		return errors.New("minicluster is not healthy after 120s")
	}
	log.Info("minicluster started")
	return nil
}

func (cluster *MiniClusterV2) Stop() error {
	log.Info("mini cluster stop")
	cluster.RootCoord.Stop()
	log.Info("mini cluster rootCoord stopped")
	cluster.DataCoord.Stop()
	log.Info("mini cluster dataCoord stopped")
	cluster.QueryCoord.Stop()
	log.Info("mini cluster queryCoord stopped")
	cluster.Proxy.Stop()
	log.Info("mini cluster proxy stopped")

	cluster.DataNode.Stop()
	log.Info("mini cluster dataNode stopped")
	cluster.QueryNode.Stop()
	log.Info("mini cluster queryNode stopped")
	cluster.IndexNode.Stop()
	log.Info("mini cluster indexNode stopped")

	cluster.EtcdCli.KV.Delete(cluster.ctx, params.EtcdCfg.RootPath.GetValue(), clientv3.WithPrefix())
	defer cluster.EtcdCli.Close()

	if cluster.ChunkManager == nil {
		chunkManager, err := cluster.factory.NewPersistentStorageChunkManager(cluster.ctx)
		if err != nil {
			log.Warn("fail to create chunk manager to clean test data", zap.Error(err))
		} else {
			cluster.ChunkManager = chunkManager
		}
	}
	cluster.ChunkManager.RemoveWithPrefix(cluster.ctx, cluster.ChunkManager.RootPath())
	return nil
}

func (cluster *MiniClusterV2) GetContext() context.Context {
	return cluster.ctx
}

func GetAvailablePorts(n int) ([]int, error) {
	ports := make([]int, n)
	for i := range ports {
		port, err := GetAvailablePort()
		if err != nil {
			return nil, err
		}
		ports[i] = port
	}
	return ports, nil
}

func GetAvailablePort() (int, error) {
	address, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:0", "0.0.0.0"))
	if err != nil {
		return 0, err
	}
	listener, err := net.ListenTCP("tcp", address)
	if err != nil {
		return 0, err
	}
	defer listener.Close()
	return listener.Addr().(*net.TCPAddr).Port, nil
}
